diff options
| author | Jean-Philippe Brucker <jean-philippe.brucker@arm.com> | 2017-12-14 11:03:01 +0000 |
|---|---|---|
| committer | Will Deacon <will.deacon@arm.com> | 2018-01-02 16:45:45 +0000 |
| commit | 57d72e159b60456c8bb281736c02ddd3164037aa (patch) | |
| tree | fa8a71f06bc09e1943cdba7be57c74687868a8b4 | |
| parent | 30a7acd573899fd8b8ac39236eff6468b195ac7d (diff) | |
| download | linux-57d72e159b60456c8bb281736c02ddd3164037aa.tar.bz2 | |
iommu/arm-smmu-v3: Don't free page table ops twice
Kasan reports a double free when finalise_stage_fn fails: the io_pgtable
ops are freed by arm_smmu_domain_finalise and then again by
arm_smmu_domain_free. Prevent this by leaving pgtbl_ops empty on failure.
Cc: <stable@vger.kernel.org>
Fixes: 48ec83bcbcf5 ("iommu/arm-smmu: Add initial driver support for ARM SMMUv3 devices")
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
| -rw-r--r-- | drivers/iommu/arm-smmu-v3.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index f122071688fd..db4281d0e269 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -1698,13 +1698,15 @@ static int arm_smmu_domain_finalise(struct iommu_domain *domain) domain->pgsize_bitmap = pgtbl_cfg.pgsize_bitmap; domain->geometry.aperture_end = (1UL << ias) - 1; domain->geometry.force_aperture = true; - smmu_domain->pgtbl_ops = pgtbl_ops; ret = finalise_stage_fn(smmu_domain, &pgtbl_cfg); - if (ret < 0) + if (ret < 0) { free_io_pgtable_ops(pgtbl_ops); + return ret; + } - return ret; + smmu_domain->pgtbl_ops = pgtbl_ops; + return 0; } static __le64 *arm_smmu_get_step_for_sid(struct arm_smmu_device *smmu, u32 sid) |